EP0359088B1 - Apparatus for producing a pipe with annular ribs - Google Patents

Apparatus for producing a pipe with annular ribs Download PDF

Info

Publication number
EP0359088B1
EP0359088B1 EP89116329A EP89116329A EP0359088B1 EP 0359088 B1 EP0359088 B1 EP 0359088B1 EP 89116329 A EP89116329 A EP 89116329A EP 89116329 A EP89116329 A EP 89116329A EP 0359088 B1 EP0359088 B1 EP 0359088B1
Authority
EP
European Patent Office
Prior art keywords
mold
accumulator chamber
thermoplastic material
troughs
molding
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Revoked
Application number
EP89116329A
Other languages
German (de)
English (en)
French (fr)
Other versions
EP0359088A2 (en
EP0359088A3 (en
Inventor
Manfred Arno Alfred Lupke
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Individual
Original Assignee
Individual
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Family has litigation
First worldwide family litigation filed litigation Critical https://patents.darts-ip.com/?family=4138739&utm_source=google_patent&utm_medium=platform_link&utm_campaign=public_patent_search&patent=EP0359088(B1) "Global patent litigation dataset” by Darts-ip is licensed under a Creative Commons Attribution 4.0 International License.
Application filed by Individual filed Critical Individual
Priority to AT89116329T priority Critical patent/ATE97056T1/de
Publication of EP0359088A2 publication Critical patent/EP0359088A2/en
Publication of EP0359088A3 publication Critical patent/EP0359088A3/en
Application granted granted Critical
Publication of EP0359088B1 publication Critical patent/EP0359088B1/en
Anticipated expiration legal-status Critical
Revoked legal-status Critical Current

Links

Images

Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C48/00—Extrusion moulding, i.e. expressing the moulding material through a die or nozzle which imparts the desired form; Apparatus therefor
    • B29C48/25—Component parts, details or accessories; Auxiliary operations
    • B29C48/30—Extrusion nozzles or dies
    • B29C48/303—Extrusion nozzles or dies using dies or die parts movable in a closed circuit, e.g. mounted on movable endless support
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C48/00—Extrusion moulding, i.e. expressing the moulding material through a die or nozzle which imparts the desired form; Apparatus therefor
    • B29C48/03—Extrusion moulding, i.e. expressing the moulding material through a die or nozzle which imparts the desired form; Apparatus therefor characterised by the shape of the extruded material at extrusion
    • B29C48/09—Articles with cross-sections having partially or fully enclosed cavities, e.g. pipes or channels
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C48/00—Extrusion moulding, i.e. expressing the moulding material through a die or nozzle which imparts the desired form; Apparatus therefor
    • B29C48/03—Extrusion moulding, i.e. expressing the moulding material through a die or nozzle which imparts the desired form; Apparatus therefor characterised by the shape of the extruded material at extrusion
    • B29C48/13—Articles with a cross-section varying in the longitudinal direction, e.g. corrugated pipes
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C48/00—Extrusion moulding, i.e. expressing the moulding material through a die or nozzle which imparts the desired form; Apparatus therefor
    • B29C48/25—Component parts, details or accessories; Auxiliary operations
    • B29C48/92—Measuring, controlling or regulating
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C2948/00—Indexing scheme relating to extrusion moulding
    • B29C2948/92—Measuring, controlling or regulating
    • B29C2948/92504—Controlled parameter
    • B29C2948/92514—Pressure
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C2948/00—Indexing scheme relating to extrusion moulding
    • B29C2948/92—Measuring, controlling or regulating
    • B29C2948/92819—Location or phase of control
    • B29C2948/92857—Extrusion unit
    • B29C2948/92904—Die; Nozzle zone
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29L—INDEXING SCHEME ASSOCIATED WITH SUBCLASS B29C, RELATING TO PARTICULAR ARTICLES
    • B29L2016/00—Articles with corrugations or pleats

Definitions

  • the invention relates to a method for extruding seamless plastic tubing having annular solid ribs spaced one from the other by grooves along the length of such tubing, comprising extruding a thermoplastic material at a predetermined rate into an axially advancing mold tunnel having radially outwardly extending troughs for molding said ribs the troughs being axially separated one from another by crests for molding the grooves.
  • the invention furthermore relates to an apparatus for producing thermoplastic tubing having annular solid ribs spaced from one another by grooves, the apparatus comprising a pair of complementary mold assemblies each comprising an endless chain of articulated interconnected mold blocks driven in synchronism with the mold blocks of the other mold assembly along a forward run and back along a return run, the mold blocks cooperating in pairs along said forward run to provide an axially advancing tubular mold tunnel having a corrugated wall defined by alterning crests and troughs in the mold-defining faces of the mold blocks, extrusion means disposed at the entrance to the mold tunnel for extruding a tube of thermoplastic material, and means for urging said tube outwardly against said corrugated wall.
  • the annular extrusion orifice is defined by a nozzle and conical mandrel disposed coaxially within the nozzle and connected to a downstream cylinder or sleeve which functions to guide the molten thermoplastic material toward the mold cavity and to provide the smooth inner surface of the pipe.
  • the sleeve is disposed a considerable distance downstream from the nozzle with the result that the molding space defined by the nozzle, the mandrel and the sleeve has an excessive volume.
  • the thermoplastic material is cooled excessively and becomes too stiff to flow into the rib recesses in the mold blocks.
  • Polyvinylchloride is a very useful thermoplastic material for forming pipes and this material will disintergrate if the temperature is raised too high.
  • the extrusion orifice has an axial length less than the space between two annular ribs on the product pipe. While this procedure avoids cooling and flow problems associated with the use of large molding volumes, another problem arises due to the variation in the requirement of plastic material during operation of the apparatus. This variation results from the different thicknesses of pipe wall required for ribs and for the grooves. Thus, a considerable amount of thermoplastic material is required to fill the annular troughs in the mold blocks to form the ribs of the tubing.
  • WO 88/06087 proposes a method for the production of ribbed pipes in which the pressure is restored to a proper value by directly measuring the pressure of the material contained in the molding space by means of a pressure sensor which adjust the speed of the extruder or the chill molds. This is merely an indirect flow control.
  • thermoplastic material from an extrusion orifice into an accumulator chamber having an open face to the troughs and crests for the discharge of said plastic material therefrom, varying the effective volume of said accumulator chamber to compensate for the varying requirement for the thermoplastic material for molding the pipe ribs in the troughs and for molding the pipe grooves at the crests.
  • an apparatus of the above type in which an accumulator chamber is provided open to said corrugated wall, said chamber being located to receive thermoplastic material from the extrusion means and to discharge said thermoplastic material into said mold tunnel; and means for varying the effective volume of said accumulator chamber to compensate for the varying requirement of the thermoplastic material for molding the pipe ribs in the troughs and for molding the pipe grooves at the crests.
  • an apparatus of the above type characterized by an accumulator chamber provided open to said corrugated wall, said chamber being located to receive thermoplastic material from the extrusion means and to discharge said thermoplastic material into said mold tunnel, and said chamber comprising at least one helical channel in a forming plug for the tube, said channel being arranged to open into more than one trough.
  • the apparatus comprises a carriage 10 supporting a pair of complementary upper and lower mold assemblies 14 and 15 respectively.
  • Each mold assembly 14 and 15 coprises an endless chain of articulately interconnected mold blocks 16.
  • the mold assembly 14 further comprises a pair of transversely spaced endless conveyor chains (only one of which is shown in the drawings and is denoted by the reference numeral 17), with each mold block 16 of the assembly 14 extending transversely between opposed links of these chains.
  • the mold assembly 15 likewise further comprises a pair of endless conveyor chains (only one of which is shown in the drawings and is denoted by the reference number 18), with each mold block 16 of the assembly 15 extending transversely between opposed links of this pair of chains including the chain 18.
  • the chains are entrained around drive sprokets 19 and 20, with drive means (not shown) being connected to at least one of the sprockets 19 and at least one of the sprockets 20 for operatively driving the mold blocks 16 of each assembly 14 and 15 in synchronism along forward run and back along a return run, the mold blocks 16 of the assemblies 14 and 15 cooperating in pairs along the forward run to define an axially extending tubular mold tunnel.
  • the mold assemblies 14 and 15 may be operatively positioned to locate an extrusion head 23 being operatively coupled to the nozzle of an extrusion machine, which may be of conventional form. If required, the mold assemblies 14 and 15 can be moved away from the extrusion head 23 by movement of the carriage 10 in order to provide access to the extrusion head 23.
  • the extrusion head 23 comprises an axially extending tubular portion 26 which is surrounded in spaced relationship thereto by a tubular member 27, one end portion of which screw-threadedly supports an outer member 28 of an annular extrusion nozzle.
  • the tubular portion 26 carries an inner member 29 of the extrusion nozzle having a frusto-conical surface 25.
  • annular passage 30 of generally frusto-conical form which terminates in annular orifice 31 and which communicates with the annular space 32 between the tube 27 and the portion 26 of the member 25.
  • This annular space 32 communicates with the nozzle of the extrusion machine (not shown) passing the thermoplastic material, such as PVC to the extrusion nozzle formed by members 28 and 29.
  • the extrusion head 23 Downstream of the extrusion nozzle 24 the extrusion head 23 carries a generally cylindrical forming plug 46 having an outer surface 48.
  • the plug 46 is effective to cause thermoplastic material leaving the extrusion nozzle 24 to be molded by mold blocks 16.
  • plug 46 forces thermoplastic material into troughs 36 of the mold blocks 16 to form annular ribs on the outer surface of the resulting pipe.
  • a cooling plug 47 Downstream of plug 46 is a cooling plug 47 which is tubular in form and may be cooled by any conventional means to aid setting of the thermoplastic pipe.
  • An important feature of the present invention is the provision of means to smooth out the pressure variations occurring in molding between troughs 36 corresponding to ribs of the pipe and crests 37 corresponding to grooves of the pipe.
  • FIGS. 3 and 4 show one embodiment to smooth out the pressure variations.
  • An annular compartment 50 is provided in the outer surface 48 of plug 40. This compartment is connected to a source of hydraulic or pneumatic fluid 51 through channel 52. The interface between the hydraulic or pneumatic fluid 51 with the thermoplastic material 53 effectively forms a movable wall so that the effective size of compartment 50 is variable for thermoplastic material.
  • Figure 3 shows the state of affairs at the start of the passage of a crest 37 of the mold block 16 which is travelling in the direction of arrow B.
  • the pressure of thermoplastic material builds and forces hydraulic fluid in the direction of arrow A to enlarge effectively compartment 50.
  • pressure of the plastic material 54 is relieved as recess 36' becomes available to it.
  • the hydraulic or pneumatic system compensates for this by flowing fluid in channel 52 into compartment 50 in the direction of arrows C to exert pressure on plastic material 53 to flow it into recess 36'. This cycle is repeated as the mold blocks advance in the direction of the arrow B.
  • Figures 5 and 6 show a different embodiment for smoothing out the pressure variations in which outer member 28 of the extrusion nozzle 24 is formed with a separate annular tip 56 slidably connected to the body of member 28 and biassed forwardly thereof through springs 58.
  • the pressure of thermoplastics material 54 is relieved and the tip 56 is located in a forward position with springs 58 extended as shown in Figure 6.
  • the pressure of thermoplastic material 54 increases to force tip 56 to retreat to compress springs 88.
  • the effective rate of advance of the nozzle blocks 16 is greater than their actual advance in the regions of crests 37.
  • the outer surface 48 of plug 46 is shown as smooth to ensure a smooth inner surface of the resulting pipe.
  • the surfaces of the crests 37 and troughs 36 are shown as smooth.
  • the surfaces of crests 37 and troughs 36 may be patterned. Such patterning may be, for example, the provision of additional strengthening of decorative annular indentations in the crests 37 to produce annular prominences in the grooves of the formed pipe.
  • Figure 7 shows a slightly different embodiment having some similarities with the embodiment of Figures 3 and 4.
  • the embodiment of Figure 7 provides helical channels 60 in the surface 48 of plug 46.
  • thermoplastic material When the crest 37 of a mold block 16 is passing, thermoplastic material will be forced into channels 60 communicating with both a crest 37 and an adjacent trough 36.
  • thermoplastic material may flow in channels 60 to equalize pressure between the crest 37 and an adjacent downstream trough 36.
  • a trough 36 passes orifice 32, there may be back flow into it from channels 60.

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Manufacturing & Machinery (AREA)
  • Extrusion Moulding Of Plastics Or The Like (AREA)
  • Nitrogen And Oxygen Or Sulfur-Condensed Heterocyclic Ring Systems (AREA)
  • Nitrogen Condensed Heterocyclic Rings (AREA)
  • Moulds For Moulding Plastics Or The Like (AREA)
  • Shaping Of Tube Ends By Bending Or Straightening (AREA)
  • Vaporization, Distillation, Condensation, Sublimation, And Cold Traps (AREA)
EP89116329A 1988-09-16 1989-09-05 Apparatus for producing a pipe with annular ribs Revoked EP0359088B1 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
AT89116329T ATE97056T1 (de) 1988-09-16 1989-09-05 Vorrichtung zur herstellung von rohren mit ringfoermigen rippen.

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
CA577653 1988-09-16
CA000577653A CA1303315C (en) 1988-09-16 1988-09-16 Apparatus for producing pipe with annular ribs

Publications (3)

Publication Number Publication Date
EP0359088A2 EP0359088A2 (en) 1990-03-21
EP0359088A3 EP0359088A3 (en) 1990-09-19
EP0359088B1 true EP0359088B1 (en) 1993-11-10

Family

ID=4138739

Family Applications (1)

Application Number Title Priority Date Filing Date
EP89116329A Revoked EP0359088B1 (en) 1988-09-16 1989-09-05 Apparatus for producing a pipe with annular ribs

Country Status (8)

Country Link
US (1) US5023029A (fi)
EP (1) EP0359088B1 (fi)
JP (1) JPH02120022A (fi)
CN (1) CN1041131A (fi)
AT (1) ATE97056T1 (fi)
CA (1) CA1303315C (fi)
DE (1) DE68910624D1 (fi)
FI (1) FI894340A (fi)

Families Citing this family (17)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FI85239C (fi) * 1989-07-12 1992-03-25 Uponor Nv Anordning foer framstaellning av kamflaensroer.
US5062782A (en) * 1990-07-24 1991-11-05 Bridgestone/Firestone, Inc. Coextrusion apparatus for varying the inner and/or outer profile of a tubular extrudate
US5128084A (en) * 1990-07-24 1992-07-07 Bridgestone Firestone Inc Coextrusion apparatus and method for varying the inner profile of a tubular extrudate
DE4111228A1 (de) * 1991-04-08 1992-10-15 Wilhelm Hegler Vorrichtung zur herstellung von kunststoff-rohren
GB9112997D0 (en) * 1991-06-17 1991-08-07 Lupke Manfred Arno Alfred Extrusion die with interchangeable extrusion nozzles
CA2223520C (en) * 1991-11-22 2001-02-06 Manfred A. A. Lupke Method and apparatus of forming profiled pipe
US5296188A (en) * 1992-01-14 1994-03-22 Corma, Inc. Methods for forming tubing utilizing suction and pneumatic pressure at the surface of the cooling plug
FI98137C (fi) * 1992-03-30 1997-04-25 Uponor Bv Menetelmä ja laite muoviputken orientoimiseksi sekä menetelmällä aikaansaatu orientoitu ripalaippamuoviputki
DE4224514A1 (de) * 1992-07-24 1994-01-27 Wilhelm Hegler Vorrichtung zum Herstellen eines Kunststoff-Rohres mit Querprofilierung
US5489201A (en) * 1993-04-15 1996-02-06 Cullom Machine Tool & Die, Inc. Plastic tile corrugator and mold blocks
CN1051268C (zh) * 1994-01-12 2000-04-12 曼夫瑞德·A·A·鲁波克 制造环状加肋塑料管的装置和方法
CN1079723C (zh) * 1997-06-19 2002-02-27 张健 热塑性制品热压成型工艺及其热压成型设备
ES2292618T5 (es) * 2001-03-02 2014-04-14 Manfred Arno Alfred Lupke Procedimiento y dispositivo para fabricar un tubo termoplástico de doble pared con un manguito de acoplamiento
US20040047932A1 (en) * 2002-09-09 2004-03-11 Lupke Manfred A. A. Pipe mold apparatus with contact and air cooling of plastic in a mold tunnel
DE10335518A1 (de) * 2003-07-31 2005-02-24 Manfred Arno Alfred Thornhill Lupke Vorrichtung zur Herstellung eines doppelwandigen thermoplastischen Rohrs mit einer Rohrmuffe
DE102005029580B3 (de) * 2005-06-25 2006-10-26 Unicor Gmbh Vorrichtung zur Herstellung von doppelwandigen Verbundrohren
CN103752955A (zh) * 2013-12-15 2014-04-30 四川惊雷科技股份有限公司 三维肋管加工机床

Family Cites Families (31)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE1207606B (de) * 1961-08-03 1965-12-23 Rastatter Kunststoffwerk G M B Vorrichtung zum Auspressen eines Schlauches unterschiedlicher Wandstaerke aus thermoplastischen Kunststoffen
US3280847A (en) * 1961-09-19 1966-10-25 Dow Chemical Co Extrusion die
US3515778A (en) * 1967-03-02 1970-06-02 Du Pont Continuous molding of thermoplastic resin
GB1262285A (en) * 1968-03-28 1972-02-02 Ici Ltd Method and apparatus for flow rate control in continuous extrusion
US3635631A (en) * 1970-06-10 1972-01-18 Du Pont Continuous molding of thermoplastic resin
US3891007A (en) * 1972-07-03 1975-06-24 Dayco Corp Exteriorly corrugated hose of composite materials
US3981663A (en) * 1973-09-10 1976-09-21 Lupke Gerd Paul Heinrich Apparatus for making high speed corrugated plastic tubing
CA1083765A (en) * 1976-12-01 1980-08-19 Gerd P. H. Lupke Apparatus for producing thermoplastic tubing
CH621733A5 (fi) * 1976-12-10 1981-02-27 Tetra Pak Dev
CA1083766A (en) * 1977-02-07 1980-08-19 Gerd P.H. Lupke Apparatus for producing thermoplastic tubing
US4136143A (en) * 1977-02-22 1979-01-23 Lupke Gerd Paul Heinrich Apparatus for and method of producing corrugated thermoplastic tubing
FR2383742A1 (fr) * 1977-03-18 1978-10-13 Lupke Gerd Paul Heinrich Appareil et procede de perforation de tubes, et procede de fabrication d'une partie de cet appareil
CA1092764A (en) * 1977-09-13 1981-01-06 Gerd P.H. Lupke Apparatus for and method of producing corrugated thermoplastic tubing
FR2424123A1 (fr) * 1978-04-24 1979-11-23 Armosig Procede et appareillage pour la fabrication en continu de profiles tubulaires ailetes en matiere synthetique
JPS5532609A (en) * 1978-08-31 1980-03-07 Toyo Kasei:Kk Device for manufacturing flexible hose
CA1172813A (en) * 1982-06-16 1984-08-21 Lupke, Manfred A. A. Apparatus for producing multi-walled thermoplastic tubing
CA1187258A (en) * 1982-12-02 1985-05-21 Lupke, Manfred A. A. Method and apparatus for forming a double walled thermoplastic tube with integral bells
CA1198864A (en) * 1983-02-21 1986-01-07 Manfred A.A. Lupke Producing thermoplastic articles, particularly with porous walls
DE3407789A1 (de) * 1983-03-18 1984-10-25 Barmag Barmer Maschinenfabrik Ag, 5630 Remscheid Schneckenextruder
US4500284A (en) * 1983-09-16 1985-02-19 Lupke Manfred Arno Alfred Forming single wall bells in double wall pipe
SE449456B (sv) * 1983-11-15 1987-05-04 Uponor Ab Forfarande och anordning for framstellning av ror varvid formbacksdelarna er delade i formstreckans lengsriktning
DE3414444A1 (de) * 1984-04-17 1985-10-17 Continental Gummi-Werke Ag, 3000 Hannover Strangpresse
US4846660A (en) * 1984-07-18 1989-07-11 Contech Construction Products Inc. Apparatus for producing double wall pipe
FI74654C (fi) * 1986-01-13 1988-03-10 Uponor Nv Anordning och foerfarande foer framstaellning av kamflaensroer.
US4770618A (en) * 1986-01-15 1988-09-13 Lupke Manfred Arno Alfred Extrusion die for two-ply plastic tubing
FI77405C (fi) * 1986-03-20 1989-03-10 Uponor Nv Foerfarande och anordning foer framstaellning av kamflaensroer.
US4712993A (en) * 1986-03-25 1987-12-15 Lupke Manfred Arno Alfred Extrusion die for externally ribbed plastic tubing
DE3701822A1 (de) * 1987-01-22 1988-08-11 Uponor Nv Verfahren und anordnung zum strangpressen von kunststoffrohren
EP0352255B1 (en) * 1987-02-19 1992-05-13 Uponor N.V. A method and an apparatus for the production of ribbed pipes
DE3725286A1 (de) * 1987-07-30 1989-02-09 Wilhelm Hegler Verfahren und vorrichtung zum herstellen eines rippen-rohres aus kunststoff
DE3737588C3 (de) * 1987-11-05 1993-12-23 Corma Inc Verfahren zum Herstellen eines innen glatten, außen gerippten Rohres aus extrudierbarem Kunststoff sowie Vorrichtung zur Durchführung des Verfahrens

Also Published As

Publication number Publication date
FI894340A (fi) 1990-03-17
ATE97056T1 (de) 1993-11-15
JPH02120022A (ja) 1990-05-08
FI894340A0 (fi) 1989-09-14
US5023029A (en) 1991-06-11
CA1303315C (en) 1992-06-16
EP0359088A2 (en) 1990-03-21
DE68910624D1 (de) 1993-12-16
CN1041131A (zh) 1990-04-11
EP0359088A3 (en) 1990-09-19

Similar Documents

Publication Publication Date Title
EP0359088B1 (en) Apparatus for producing a pipe with annular ribs
RU2367571C2 (ru) Способ непрерывного изготовления соединительной трубы с муфтой, соединительная труба и устройство для изготовления соединительной трубы
US4548569A (en) Accumulator head
CA1268615A (en) Method and an apparatus for the production of ribbed pipes
SU1508950A3 (ru) Аппарат дл формовани оребренных снаружи термопластических и гофрированных труб
JPH0679826B2 (ja) 押出物の連続成形のための方法および装置に関する改良
EP0290429B1 (en) Apparatus and method for the production of ribbed pipes
US3239881A (en) Apparatus for impact extrusion
US5785920A (en) Extrusion molding apparatus and method of forming a parison
US4563147A (en) Apparatus for extruding a tube
EP0483153B2 (en) Method for forming tubing utilizing suction and pneumatic pressure at the surface of the cooling plug
US5221541A (en) Extruder head for elastomeric material
EP0363716A2 (en) Extrusion die assembly
JP3085977B2 (ja) 環状リブ付きプラスチックパイプの製造装置及び製造方法
EP0381938B1 (en) Cooling plugs in thermoplastic pipe forming apparatus
CA1057925A (en) Apparatus for forming plastic tubes using continuous chains of half-dies
DE3272185D1 (en) Method of extruding a plastics hollow profile
JPH0661821B2 (ja) リブ付きパイプの製造方法および装置
US3409941A (en) Apparatus for producing plastic articles
NL193610C (nl) Werkwijze voor het extruderen van kunststof pijpen.
JPS6338285B2 (fi)
NL8701164A (nl) Kunststofbuis met aan het buitenoppervlak massieve dwarsribben, inrichting voor toepassing in een installatie voor het vormen van dergelijke buizen; installatie voor het vormen van buizen die een dergelijke inrichting omvat en werkwijze voor het vormen van een kunststofbuis onder toepassing van een dergelijke installatie.
SU835802A1 (ru) Экструзионна головка дл полимерныхМАТЕРиАлОВ
KR940003705A (ko) 폭발확관용 플라스틱관의 제조장치 및 방법
US3281900A (en) Extrusion apparatus

Legal Events

Date Code Title Description
PUAI Public reference made under article 153(3) epc to a published international application that has entered the european phase

Free format text: ORIGINAL CODE: 0009012

AK Designated contracting states

Kind code of ref document: A2

Designated state(s): AT DE FR GB GR IT NL SE

PUAL Search report despatched

Free format text: ORIGINAL CODE: 0009013

AK Designated contracting states

Kind code of ref document: A3

Designated state(s): AT DE FR GB GR IT NL SE

17P Request for examination filed

Effective date: 19910305

17Q First examination report despatched

Effective date: 19920622

GRAA (expected) grant

Free format text: ORIGINAL CODE: 0009210

AK Designated contracting states

Kind code of ref document: B1

Designated state(s): AT DE FR GB GR IT NL SE

PG25 Lapsed in a contracting state [announced via postgrant information from national office to epo]

Ref country code: IT

Free format text: LAPSE BECAUSE OF FAILURE TO SUBMIT A TRANSLATION OF THE DESCRIPTION OR TO PAY THE FEE WITHIN THE PRE;WARNING: LAPSES OF ITALIAN PATENTS WITH EFFECTIVE DATE BEFORE 2007 MAY HAVE OCCURRED AT ANY TIME BEFORE 2007. THE CORRECT EFFECTIVE DATE MAY BE DIFFERENT FROM THE ONE RECORDED.SCRIBED TIME-LIMIT

Effective date: 19931110

Ref country code: SE

Effective date: 19931110

Ref country code: FR

Effective date: 19931110

Ref country code: AT

Effective date: 19931110

Ref country code: DE

Effective date: 19931110

REF Corresponds to:

Ref document number: 97056

Country of ref document: AT

Date of ref document: 19931115

Kind code of ref document: T

REF Corresponds to:

Ref document number: 68910624

Country of ref document: DE

Date of ref document: 19931216

EN Fr: translation not filed
PLBI Opposition filed

Free format text: ORIGINAL CODE: 0009260

PG25 Lapsed in a contracting state [announced via postgrant information from national office to epo]

Ref country code: GB

Effective date: 19940905

26 Opposition filed

Opponent name: OY UPONOR AB

Effective date: 19940809

NLR1 Nl: opposition has been filed with the epo

Opponent name: OY UPONOR AB.

GBPC Gb: european patent ceased through non-payment of renewal fee

Effective date: 19940905

RDAG Patent revoked

Free format text: ORIGINAL CODE: 0009271

STAA Information on the status of an ep patent application or granted ep patent

Free format text: STATUS: PATENT REVOKED

NLV4 Nl: lapsed or anulled due to non-payment of the annual fee
27W Patent revoked

Effective date: 19950216